<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right" class="breadcrumb">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible=true">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
          <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色描述" prop="roleName"></el-table-column>
        <el-table-column label="角色" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" 
            size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" 
            size="mini" @click="removeRoleById(scope.row.id)">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" 
            size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
         <!-- 展开列 -->
        <el-table-column type="expand" label="查看详情" width="100px">
            <template slot-scope="scope">
                <el-row :class="['bdbottom',i1===0 ? 'bdtop' : '']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                    <!-- 渲染一级权限 -->
                    <el-col :span="5">
                        <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                        <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二级和三级权限 -->
                    <el-col :span="19">
                        <!-- 通过for循环嵌套渲染二级权限 -->
                        <el-row :class="[i2===0 ? '' : 'bdtop']" v-for="(item2,i2) in item1.children" :key="item2.id">
                            <el-col :span="6">
                                <el-tag closable @close="removeRightById(scope.row,item2.id)" type="success">{{item2.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 三级权限 -->
                            <el-col :span="18">
                                <el-tag closable @close="removeRightById(scope.row,item3.id)" type="warning" v-for="item3 in item2.children" :key="item3.id">
                                    {{item3.authName}}
                                </el-tag>
                            </el-col>
                        </el-row>
                    </el-col>
                </el-row>
            </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 添加用户的对话框 -->
    <el-dialog
    title="添加用户"
    @close="addDialogClosed"
    :visible.sync="addDialogVisible"
    width="50%">
    <!-- 内容主体区 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
            <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="addForm.roleName"></el-input>
            </el-form-item>
            <el-form-item label="角色描述" prop="roleDesc">
                <el-input v-model="addForm.roleDesc"></el-input>
            </el-form-item>
        </el-form>
        <!-- 底部区 -->
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addRole">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改角色的对话框 -->
    <el-dialog
    title="修改角色"
    @close="editDialogClosed"
    :visible.sync="editDialogVisible"
    width="50%">
      <el-form ref="editFormRef" :model="editForm" label-width="80px" :rules="addFormRules">
          <el-form-item label="角色名称" prop="roleName">
              <el-input v-model="editForm.roleName"></el-input>
          </el-form-item>
          <el-form-item label="角色描述" prop="roleDesc">
              <el-input v-model="editForm.roleDesc"></el-input>
          </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRolesInfo">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 分配权限的对话框 -->
    <el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="50%">
    <!-- 树形空间 -->
    <el-tree :data="rightsList" :props="treeProps" 
    :default-checked-keys="defKeys" ref="treeRef"
    show-checkbox node-key="id" default-expand-all></el-tree>
    <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //  所有角色列表数据
        roleList: [],
        editDialogVisible:false,
        editForm:{},
        addFormRules:{
        roleName:[
            { required: true, message: '请输入角色名称', trigger: 'blur' },
            { min: 2, max: 10, message: '角色名称长度在 2 到 10 个字符', trigger: 'blur' }
        ],
        roleDesc:[
            { required: true, message: '请输入角色描述', trigger: 'blur' },
            { min: 2, max: 10, message: '角色描述长度在 2 到 10 个字符', trigger: 'blur' }
        ],
      },
        addDialogVisible:false,
        addForm:{},
        setRightDialogVisible:false,
        //   所有权限的数据
        rightsList:{},
        // 树形控件的绑定对象
        treeProps:{
            label:'authName',
            children:'children',
        },
        // 选中的树节点
        defKeys:[],
        // 当前即将分配角色的roleid
        roleId:''
    }
  },
  created() {
    this.getRoleList()
  },
  methods: {
    async getRoleList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200)
        return this.$message.error('获取角色列表失败！')
      this.roleList = res.data
    },
    // 展示编辑角色的对话框
    async showEditDialog(id){
        const {data:res}=await this.$http.get('roles/'+id)
        if(res.meta.status!==200){
            return this.$message.error('查询角色信息失败')
        }
        this.editForm=res.data;
        console.log(this.editForm)
        this.editDialogVisible=true;
    },
    // 监听修改用户对话框的关闭事件
    editDialogClosed(){
        this.$refs.editFormRef.resetFields();
    },
    // 编辑角色
    editRolesInfo(){
        this.$refs.editFormRef.validate(async valid=>{
            if(!valid) return;
            const {data:res}=await this.$http.put('roles/'+this.editForm.roleId,
            {roleName:this.editForm.roleName,roleDesc:this.editForm.roleDesc});
            if(res.meta.status!==200){
                return this.$message.error('更新角色信息失败')
            }
            // 关闭对话框
            this.editDialogVisible=false;
            // 刷新数据列表
            this.getRoleList();
            // 提示修改信息成功
            this.$message.success('更新角色信息成功');
        })
    },
    // 监听添加角色对话框的关闭事件
    addDialogClosed(){
        this.$refs.addFormRef.resetFields();
    },
    // 添加角色
    addRole(){
       this.$refs.addFormRef.validate(async valid=>{
            if(!valid) return;
            // 可以发起添加用户的网络请求
            const {data:res}=await this.$http.post('roles',this.addForm);
            if(res.meta.status!==201){
                return this.$message.error('添加角色失败')
            }
            this.$message.success('添加角色成功！')
            // 隐藏添加用户的对话框
            this.addDialogVisible=false;
            // 重新获取用户列表数据
            this.getRoleList();
        }) 
    },
    // 删除角色
    async removeRoleById(id){
        // 弹框询问用户是否删除数据
         const confirmResult=await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err);
        // 如果用户确认删除则返回字符串 confirm
        // 如果用户取消删除则返回字符串 cancel
        if(confirmResult !=='confirm') return this.$message.info('已取消删除');
        // 删除用户
        const {data:res}=await this.$http.delete('roles/'+id)
        if(res.meta.status!==200) return this.$message.error('删除角色失败');
        this.$message.success('删除角色成功');
        this.getRoleList();
    },
    // 根据id删除对应的权限
    async removeRightById(role,rightId){        //该角色数据，要删除的权限id
        // 弹窗提示用户是否要删除数据
        const confirmResult=await this.$confirm('此操作将永久删除该数据, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err);
        // console.log(role,rightId);
        if(confirmResult !=='confirm') return this.$message.info('已取消删除');
        const {data:res}=await this.$http.delete(`roles/${role.id}
        /rights/${rightId}`);
        if(res.meta.status!==200) return this.$message.error('删除权限失败');
        this.$message.success('删除对应权限成功');
        role.children=res.data;
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role){
        this.roleId=role.id;
        // 获取所有权限的数据
        const {data:res}=await this.$http.get('rights/tree');
        if(res.meta.status!==200) return this.$message.error('获取权限数据失败');
        this.rightsList=res.data;
        // 清空树节点列表，防止以前的数据干扰
        this.defKeys=[];
        // 递归获取三级节点的id，并添加到树节点列表
        this.getLeafKeys(role,this.defKeys);
        this.setRightDialogVisible=true;
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys数组中
    getLeafKeys(node,arr){
        // 如果当前node节点不包含children属性，则是三级节点,将该节点的id加进数组中
        if(!node.children) {
            return arr.push(node.id);
        }
        node.children.forEach(item=> this.getLeafKeys(item,arr))
    },
    async allotRights(){
        // 点击为角色分配权限
        const keys=[
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys(),
        ];
        // console.log(keys);
        const idStr=keys.join(',');
        // 将选中的权限进行授权
        const {data:res}=await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr});
        if(res.meta.status!==200) return this.$message.error('分配权限失败');
        this.$message.success('分配权限成功');
        this.getRoleList();
        this.setRightDialogVisible = false;
    }
    
  },
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 10px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
</style>